In an earlier contribution to this discussion,
sm_jamieson wrote:

I have just exposed the existing RSJs to which new load is to be
applied to support my roof.
The BCO said the bearings may need to be exposed but has said nothing
more. For peace of mind I
probably need a structural engineer to check things, but can anyone
give a rough feel for the loadings here ?

Old fashioned RSJ, width 125mm, height 150mm, flange thickness 10mm at
the edges, 15mm at the web,
web thickness 10mm. Span is 2800mm. Can anyone tell me what type of
loads this beam can take (assuming bearings are OK). Also, what type
of point load could it take near the middle of the span ?


I can't answer your question numerically - but, in a domestic situation,
you're unlikely to be able to throw anything at that RSJ which it *can't*
support.

When I recently made some structural changes to my house, the BCO said that
as long as I used a 7x4 RSJ over a similar span to yours (ok, yours is 6x5 -
but a pretty beefy one) he would be happy because it would be sufficiently
over-engineered that there couldn't possibly be any problems. On the other
hand, if I wanted to use anything less, he would need to see calculations
done by a structural engineer.
--
Cheers,
Roger
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